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Investigation of absorption and scattering properties of soot aggregates of different fractal dimension at 532 nm using RDG and GMM

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DOITrouver le DOI : https://doi.org/10.1080/02786826.2013.847525
AuteurRechercher : 1Identifiant ORCID : https://orcid.org/0000-0002-1790-6381; Rechercher : ; Rechercher : 1; Rechercher : 1Identifiant ORCID : https://orcid.org/0000-0002-6602-1926
Affiliation
  1. Conseil national de recherches Canada. Science des mesures et étalons
FormatTexte, Article
Résumé
Radiative properties of numerically generated fractal soot aggregates of different fractal dimensions were studied using the numerically accurate generalized Mie-solution method (GMM) and the Rayleigh-Debye-Gans (RDG) approximate theory. Fractal aggregates of identical prefactor but different fractal dimensions, namely, 1.4, 1.78, and 2.1, were generated numerically using a tunable algorithm of cluster–cluster aggregation for aggregates containing up to 800 primary particles. Radiative properties of these aggregates were calculated at a wavelength of 532 nm assuming a soot refractive index of 1.6 + 0.6i. Four commonly used structure factors in the RDG approximation were used to investigate the effect of structure factor on the differential and total scattering cross-sections and the asymmetry factor. The differential and total scattering properties calculated using the RDG approximation become increasingly sensitive to the structure factor with increasing the fractal dimension. Primary particle interactions are the fundamental mechanism for the aggregate absorption enhancement for small aggregates and the shielding effect for larger aggregates. The extent of these two competing factors is dependent on the fractal dimension and aggregate size. RDG reasonably predicts the effect of fractal dimension on the scattering properties, but fails to account for the effect of aggregation or fractal morphology on the absorption property of fractal soot aggregates, though the error is in general less than 15%.
Date de publication
Maison d’éditionTaylor & Francis
American Association for Aerosol Research
Dans
  • Aerosol Science and Technology 47, nº 12 (10 octobre 2013) : 1393–1405.
Langueanglais
Publications évaluées par des pairsOui
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Identificateur de l’enregistrement879ccb2e-be76-4b2d-ba8d-780ffe2425c5
Enregistrement créé2024-09-06
Enregistrement modifié2024-09-06

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